This television, radio, and digital advertising blitz, set to kick off within weeks, will focus on Americans outright skeptical of vaccines’ safety or effectiveness as well as those who are potentially more willing to seek a Covid-19 immunization but don’t yet know where, when, or how. Specifically, the campaign will target three groups in which access, apathy, or outright skepticism may pose a barrier to vaccinations: young people, people of color, and conservatives, according to a Biden aide.